Hunting for revs on idle.

[jon_r]

Car seems to be going fine now but when it settles down to idle sometimes it's fine, sometimes it settles at 2k rpm and then hunts for steady revs. If I blip it it then settles. Any ideas?

 

[benkay]

I have this too sometimes so interested if anyone has any clues.

As blipping the throttle brings it back down to normal idle, I've always presumed it's a sticky throttle body so the butterfly valve isn't closing fully.

I find it happens most often when moving along in traffic, so only very slight throttle usage. Do you find that too OP?

 

[Dean0o0o.]

Mine does the same, mainly happens when cold. It also searches for revs when i'm around 1/4 throttle and the engines cold.

I'm guessing throttle position sensor/ idle control valve?

I'm using it as an excuse to get it remapped.

 

[Russ_16v]

Jon, it will be your idle control valve, I replace 3 of the things on my black one, tried cleaning them out but lasted about a day then back to hunting. I managed to buy a new one from a chap on here who had a sticking tb, and bought it in error. Bear in mind though, check out my guide for a perminant fix to a sticking tb - doing that may help. Oh, and remember guys this is only ph1's, as ph2's don't have an icv

 

[Rob669]

I'd say if it settles after blipping the throttle then it's the throttle body or the throttle cable that's faulty. On mine it was permanently up at 1500 rpm until I replaced the idle control valve and now it's sorted.